首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2714174篇
  免费   237390篇
  国内免费   20938篇
耳鼻咽喉   36650篇
儿科学   82933篇
妇产科学   66443篇
基础医学   443573篇
口腔科学   71195篇
临床医学   244549篇
内科学   446335篇
皮肤病学   77638篇
神经病学   230929篇
特种医学   105925篇
外国民族医学   29篇
外科学   419140篇
综合类   119435篇
现状与发展   52篇
一般理论   2018篇
预防医学   236589篇
眼科学   59778篇
药学   188838篇
  200篇
中国医学   20916篇
肿瘤学   119337篇
  2022年   26334篇
  2021年   59003篇
  2020年   38674篇
  2019年   59641篇
  2018年   71129篇
  2017年   55582篇
  2016年   60070篇
  2015年   77028篇
  2014年   112511篇
  2013年   179137篇
  2012年   79497篇
  2011年   75548篇
  2010年   120121篇
  2009年   125860篇
  2008年   61543篇
  2007年   60427篇
  2006年   71552篇
  2005年   65258篇
  2004年   65453篇
  2003年   56117篇
  2002年   45578篇
  2001年   60590篇
  2000年   51451篇
  1999年   59345篇
  1998年   61015篇
  1997年   59948篇
  1996年   57100篇
  1995年   52655篇
  1994年   46845篇
  1993年   43908篇
  1992年   37878篇
  1991年   35544篇
  1990年   32781篇
  1989年   33293篇
  1988年   31253篇
  1987年   30444篇
  1986年   28973篇
  1985年   30342篇
  1984年   32482篇
  1983年   31203篇
  1982年   36244篇
  1981年   34614篇
  1980年   32709篇
  1979年   24664篇
  1978年   25357篇
  1977年   24311篇
  1976年   21984篇
  1975年   19806篇
  1974年   18498篇
  1973年   17809篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
66.
67.
68.

Background

Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).

Methods

All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.

Results

Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.

Conclusion

Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system.  相似文献   
69.
Purpose/aim: To focus on current aspects of primary thyroid lymphoma (PTL), which is a rare clinical entity usually manifested by a rapidly growing mass in the neck that can cause pressure symptoms.

Materials and Methods: Relevant papers in PubMed published through June 2017 were selected to track updated information about PTL with an emphasis on diagnosis and novel therapeutic management.

Results: The most frequent cases include non-Hodgkin lymphoma derived from B-cells, mainly diffuse large B-cell lymphoma (DLBCL) followed by mucosa-associated lymphoid tissue (MALT) lymphoma or a mixed type. Other subtypes are less common. Lymphomas derived from T-cells and Hodgkin lymphomas are extremely rare. Hashimoto's autoimmune thyroiditis has been implicated as a risk factor for lymphoma. At the molecular level, the Wnt5a protein and its receptor Ror2 are involved in the course of the disease. Ultrasonography, fine needle aspiration (FNA) biopsy, and core or open biopsy combined with new diagnostic facilities contribute to an accurate diagnosis. An increased potential exists for a cure without the need for a radical surgical procedure. Modern chemoradiation therapy plus the monoclonal antibody rituximab, which acts against CD20, have limited the need for surgical interventions and provide an excellent outcome in most cases. However, some cases have resulted in treatment failure or recurrence.

Conclusions: A multidisciplinary approach must be used to define the management policy in each case. Future efforts by researchers are likely to be focused on the molecular level.  相似文献   

70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号